With almost all highend wheelsets built with flat/bladed spokes, would using a round spoke like the dt revolution make a better handling wheel for crosswinds, like most new wheels that have wider/round profile

Maybe take a look at a spoke like the Cxrays from Sapim. They have an ovalized blade shape which makes them very aero with respectably high yaw angle tolerances.

Are they any different from DT Aerolites in that regard?

They are the same shape. The only spoke (by Sapim) that does better as far as aero goes is a type that's made especially for FKC (Francois Kerautret). Unfortunately I do not have actual details, I'm just repeating what the French press is saying here.

There is however a new flat Superspoke (Sapim again) that is reportedly lighter and potentially even more aero due to less material etc.

Not shure about this one, but my take is the wooshing sound comes from the rims, well, the rims serve as harmony tables that amplify the spokes vibrations in the wind, like a violin or guitar. That's why very thin walled, deep carbon rims seem to sound louder...

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